Lifting-jack



LIFTING-JACK.

To all ham it may concern Be it known that I, GERHARD -DERKSEN,

a citizen of the UnitedStates, and resident I of Hales Corners, in the county of Milwaukee and State of. Wisconsin, have invented certain new and useful Improvements .in LiftingJacks; and'I do hereby declare that the following is a-"full, "clear, and exact de-' scri tion thereof:-

y'invention relates lifting jacks, its

primary: object being'to provide a lifting j ack'unit' which is simple, durable and arranged'to be-manipulated to lift a load with the least possible power, due to the arrangements of the levers.

'Another object of my. invention is particularly toprovide aset of such lifting jacks forthe purposeof rais'inga vehicle,;having prieumatic'tires, from-the floor whereby load strain"isrelievedfromsaid-tires.

Still anotherobject is to provide a construction wherein the parts can be manufactured at a minimum cost due to the elimination of machinework. fi A still further object is to-provide means for adjusting-various elements of the jack to meet the" conditions of different sized wheels, and-1a stilLfurther-object is to pro vide a jack'embodying a system of levers for accomplishing the raising and lowering function without the useof worms or screws whereby-wearand. expensive structure is avoided, while at the same time quickness of action can beefiected;

.Whilethe jack unitsmay be used separately'as'in'ordi'nary cases, it'is my inten tion to. provide a 'set'of four jacks for eachvehicle whereby they can be applied to the vehicle when the sameis;.in' storage-to raise it from thefloor quickly, and due-toxthe leverage action when, aise the j ck will automatically'lock in such raised position.

'With the above and. other minor objects ,in view, the invention consists in certain peculiarities of "construction, combination and arrangement of parts as set forth hereinafter with reference to the accompanying drawing and subsequently claimed.

In the drawing:

Figure 1 representsa sectional elevation of a jack embodying the features of my invention, the section being indicated by the line 1-1 of Fig. 2, said view showing the jack elements in their lifted position and best shown in Fig. 2.

In order to' vary the length .of this hand sp gi fig pn of Letters Patent Patented Oct. 26, 1920. Application filed. ianuary 26, 1920. Serial in. 354,188. I

adjustedto'the hub of 'a wheel, the said wheel being indicatedby dotted'lines.

Fig. 2 is a face view of the jack, showmg certain parts in section to more clearly illustrate the structural features.

R ferring by characters to the drawing,

1 represents a base yokehaving slotted arms 2 which are. adapted to'receive the standards 3 that are preferably formed with edge" flanges to provide strength, which flanges are connected by web portions,,as best shown in Fig. 1'. =The standards are secured to the arms 2 byrsuitable b olts 3, and due to,

the slotted connections, these arms'mayibe. I adjusted so as to vary the length of the jack frame. The standardshave inwardly;

eXtended-trunnions 4 to. which are pivoted i thebowed legs :5 of :a hand lever 6,.the sameterminating with a convenient: hand-grip as lever, provide the gripYportionwith a stem 7 which is slottedatfigthroiighoutits length for the reception of a clamping bolt 9, which clamping bolt passes through fthe slot in the stem of the handleian'd" also through the upper terminal of the-legs- 5.

Thus it will be seen "that the stem of the handle can be lengthened and. shortened so:

as to increase and ,diminishi the. leverage.-

Thelegs of the hand lever are E also, formed with apertureslO therein 'which are slightly offset from a line 'intersecting "the centralportion of the lever and its fulcrum points 4, asbest shown in Fig. 1. Theseapertures- 10 are adapted to receive bearing [lugs 11,

of a link 12. The lower portion of'jthelink, as best shown in Fig.2, is curVedan'd-QhaS fitted to its throat portion iaflex'ible shield 13, which shield isadapted to have-contact with a hub ofthe v el' e d huSPro tect it'from-abrasions.

The throat portion of hub i 7 link has extending therefrom, a pair of -r ined? wh shril siw e p t0} ride upon the inner surface X of the standards. In order to provide adjustment as to length of the jack frame at its upper end, f

the standards have fitted thereto extension straps .16. The straps are slotted for the reception of a tie bolt 17 that is provided with suitable jam nuts 17 and clamping nuts 18, the ends of the tie bolt being extendedthrough suitable apertures "that are formed in the standards. Thus it willjbe seen that the straps may be adjusted vertically and locked in their adjusted position by tightening the nuts 18. At the same time while this tie bolt 17 forms a means to permit adjustment of the straps, it1also forms a brace for the upper portion of the -when subjected to. liftingstrain Should the hub be tapered outwardly and toward the axis of the wheel, 1 preferably provide a clampmg ring which is secured to such inclined hubs to prevent slippage of the link.

This structure, however, forms no part'of my invention and therefore is not illustrated. 7

From the foregoing description, it will be seen that' in operation the upper and lower 'ends vof the jack are-adjusted to accommomovement or the lever legs 111' one direction,

- date it'in "length to thediametr of the wheel V with resp'ect to its axis, and in order to 2-5 raise the'j'wheel' from the floor, the jack frame; is nested against the outer face of the fife: and infthis position the handle or lever 6 is swung downwardly'so that the throat portion o f thelink is quite a'dis tance below theliub, which hub projects through the; frame.

The operator simply'raises the handle or levertothe'position shownin Fig. 1, and

due toits rotation'uponthe trunnions 4, the;

hand'lever will cause the link to ride upwardly engagingthe lower surface of the "hub to liftthe same as-indicated in Fig.

plelever and link connection, a heavy load 1,thus raising the tread of the wheel fromthe ground, and as this action takes place,

it will be observed. that the bearing lugs ll which' constitute the pivot points for the l1I1l, W1ll ride past or over an imaginary line intersecting the longitudinal axis of the liftinglever 6 'and its fulcrum point,

Hence the 'load'strain upon the link has been shifted to a position where said load strain will serve to hold the lever in its normal upright position as shown in Fig. 1, and any tendencyof said lever to move farther inwardly or toward the wheel is overcome, .due tosthe fact/that the legs of the lever engage stop lugs 19 which project from the frame standards from the path of travel of the-aforesaid lever legs.

It will be observed that owing to the can be readily manipulated with'a minimum amount of power and that the ,jackwill means for adjusting thelength of the standards w1th relat1on to their upper and'lower 1 ends, trunnlons extending from the stand- (ards, a lever havingbowedlegsin pivotal union with the trunnlons, the levers beingpositioned between said standards, a link having lugs pivotally connected to the legs of-t'he lever at a predetermined point from the trunnion'connection, guide pinsextend ingfrom the lower portlonof the link'adapted to engage the sides of the standards, means extending from the'stan'dards to limit and means for adjusting th l gth f lever. 1 Y n V 2. A lifting jack comprisingstandards} means for adjusting the length of the standards with relation to theirupper and lower ends, trunnions extending from the standards, a lever having bowed lugs in pivotal 7 union withthe trunnion's, the levers being positioned between said standards, 'a link having lugs pivotally connected to the. legs.

of the lever at a predetermined-point from the trunnion connection, guide pins extending from the-lower portion of the link adapted to engage the sides of the standards.

A lifting jack comprising standards," means for adjusting the le ng-th of'the Sana ards with relation to their upper and lower ends, trunnions extending from the stand-'1 ards, a lever having bowed legs in pivotal union with the trunnions, thelevers being" positioned between said standards, adink having lugs pivotally connected to the legs of the lever at a predetermined point from the trunnion connection, guide pins eXteiiding' from the lower portion of the link adapted to engage the sides of the stand means for adjusting thelength' of ards, and the lever; Y

In testimony that I an the Me an 1* have hereunto set my hand atHales Corners, in the county of 'Milwaukee, and State of Wisconsin.

' GERHARD nnnksnn; 

